It's a self-depleting market. The optimum is, a la Big Pharma, to keep 'em in "dating" limbo.-
On the other side you got a fresh supply on both sides from kids growing up to be adults and from adults divorcing and even if your matchmaking is perfect and divorce culturally shamed against, people still die which leaves widow(er)s behind, of whom a certain amount will want a new relationship.
Dating apps are a race to the bottom. They're collecting a tax on the lonely and desperate of dwindling populations. Ironically it's not sustainable over the long term.
The entire idea of just wanting MRR and be done with it is a huge, huge part why the world is so screwed. So much of the economy is just devolved into rich people seeking rents.